[mythtv-users] HDMI issues

[Allen Edwards]

On Sat, Aug 15, 2009 at 10:00 PM, Seth Art <sethsec at gmail.com> wrote:

> Hey all,
>
> I have a problem that is not really related to MythTV, but I don't
> even know where to start troubleshooting.  If anyone can point me in
> the right direction, or point me to the right tools, I would certainly
> appreciate it.
>
> Details:
> TV: Sony Bravia KDL-40v4100
> Video Card: Nvideo 5200 (DVI, VGA, S-Video out)
> Cable: DVI to HDMI cable
> OS: Latest MythDora (10.21)
>
> Problem:  I recently purchased a new TV (above), and a new DVI (video
> card) to HDMI (TV) cable.  The problem is that when using this cable
> the screen "flickers" black for about 1-2 seconds every 2-5 minutes.
>
> It seems to only do this when playing video, or viewing pictures in
> slideshow mode.   I know it is not a MythTV issue, because I tried
> playing a video with both Totem and Xine in standalone mode, and not
> even full screen and the same problem occurs.  Interestingly even when
> the video is playing on a quater of the screen, the entire screen goes
> "blank/black" for that second or two.
>
> Troubleshooting: I hooked up my 24 inch BENQ HDMI monitor and played
> the video for a good 10 minutes without any flickers.  That certainly
> seems to rule out the cable and the video card, doesn't it?
>
> To me it seems that all that is left is: the Sony TV (please, no!) or
> a X config issue.
>
> I tailed /var/log/messages, /var/log/Xorg.0.log, and even
> /var/log/mythtv/mythfrontend.log to see if any messages popped up
> right at the flicker point, but nope.
>
> I even tried to create a custom modeline. I cant remember the tool I
> used to create the modeline (not in my history unfortunately), but
> here it is, with the rest of my monitor section of the xorg.conf:
>
> Section "Monitor"
>    Identifier     "Monitor0"
>    VendorName     "Unknown"
>    ModelName      "Unknown"
>    HorizSync       28.0 - 33.0
>    VertRefresh     43.0 - 72.0
>    Option         "DPMS"
>    # 1920x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 172.80 MHz
>    Modeline "1920x1080_60.00"  172.80  1920 2040 2248 2576  1080 1081
> 1084 1118  -HSync +Vsync
> EndSection
>
> Does anyone have any ideas?  Where should I start troubleshooting?
> Has anyone seen something similar?   Do you need more info?
>
> I should also note that when I use a VGA (video card) to VGA (TV)
> there is no flicker at all.  The main drawback is that the picture is
> noticeably less vibrant and less sharp.
>
> Thanks!
>
> Seth
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>


My suggestion is to take out as much of your xorg as possible and just let
the box figure it out.  Don't be so helpful in telling it settings.  For
example, here is my monitor section:

Section "Monitor"
        Identifier      "MythMonitor"
        Option          "DPMS"
EndSection


Allen
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